Added error for writing to /dev/ on Linux. #11991
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Ack, I just found another case - |
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Would you mind rebasing this cleanly on the latest master branch. I think it makes sense to add these error message for now. It may turn out that #11992 is a better long term fix for this, but I don't think that needs to prevent us from making this improvement now.
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There, a fresh commit atop latest master. (I have, admittedly, not tested the result at all, but the merge required no manual massaging at all, so I'm reasonably confident it won't secretly burn the fields and salt the earth.) |
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I only realized when I went to rebase all my PRs after the fun with #12072 that my pushing a rebase wouldn't have sent any notification, so, done. |
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@aerusso since you noted this issue originally I thought you might have a few minutes to review this stop gap. It's not quite a fix, but the least we can do is properly detect the issue and warn people. |
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This looks straightforward. The only thing I can suggest is that the error message,
sounds like a problem with the system (user: "Why the heck can't the stream be written to /dev/null?!"). I suggest something like
which makes it very clear that it's no fault of the user. |
That gives me a thought - how would you feel about something like:
? That way, we can minimize the number of people objecting to this/posting bugs about this, until some more permanent fix is merged. |
Starting in Linux 5.10, trying to write to /dev/{null,zero} errors out.
Prefer to inform people when this happens rather than hoping they guess
what's wrong.
Signed-off-by: Rich Ercolani <rincebrain@gmail.com>
behlendorf
added
Status: Accepted
Starting in Linux 5.10, trying to write to /dev/{null,zero} errors out.
Prefer to inform people when this happens rather than hoping they guess
what's wrong.
Reviewed-by: Antonio Russo <aerusso@aerusso.net>
Reviewed-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: John Kennedy <john.kennedy@delphix.com>
Signed-off-by: Rich Ercolani <rincebrain@gmail.com>
Closes: openzfs#11991
Starting in Linux 5.10, trying to write to /dev/{null,zero} errors out.
Prefer to inform people when this happens rather than hoping they guess
what's wrong.
Reviewed-by: Antonio Russo <aerusso@aerusso.net>
Reviewed-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: John Kennedy <john.kennedy@delphix.com>
Signed-off-by: Rich Ercolani <rincebrain@gmail.com>
Closes: openzfs#11991
Starting in Linux 5.10, trying to write to /dev/{null,zero} errors out.
Prefer to inform people when this happens rather than hoping they guess
what's wrong.
Reviewed-by: Antonio Russo <aerusso@aerusso.net>
Reviewed-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: John Kennedy <john.kennedy@delphix.com>
Signed-off-by: Rich Ercolani <rincebrain@gmail.com>
Closes: openzfs#11991
Starting in Linux 5.10, trying to write to /dev/{null,zero} errors out.
Prefer to inform people when this happens rather than hoping they guess
what's wrong.
Reviewed-by: Antonio Russo <aerusso@aerusso.net>
Reviewed-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: John Kennedy <john.kennedy@delphix.com>
Signed-off-by: Rich Ercolani <rincebrain@gmail.com>
Closes: #11991
Starting in Linux 5.10, trying to write to /dev/{null,zero} errors out.
Prefer to inform people when this happens rather than hoping they guess
what's wrong.
Reviewed-by: Antonio Russo <aerusso@aerusso.net>
Reviewed-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: John Kennedy <john.kennedy@delphix.com>
Signed-off-by: Rich Ercolani <rincebrain@gmail.com>
Closes: openzfs#11991
Starting in Linux 5.10, trying to write to /dev/{null,zero} errors out.
Prefer to inform people when this happens rather than hoping they guess
what's wrong.
Reviewed-by: Antonio Russo <aerusso@aerusso.net>
Reviewed-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: John Kennedy <john.kennedy@delphix.com>
Signed-off-by: Rich Ercolani <rincebrain@gmail.com>
Closes: openzfs#11991
Motivation and Context
Starting in Linux 5.10, trying to write to /dev/ files errors out.
Prefer to inform people when this happens rather than hoping they
guess what's wrong.
Description
Plumbed an error check in for all the zfs_send_* calls in zfs_do_send, that checks
and if all of the above are true, prints an additional message.
(I also had an implementation that just detects and rejects attempting to write /dev on
Linux, but I like this approach better. If people disagree, I'll open that PR instead.)
How Has This Been Tested?
Lightly on my Debian bullseye VM where #11445 was reproducing before; it prints the correct message on trying to overwrite dev nodes in /dev, not for attempting to write things in /proc or /sys or on the root FS.
Types of changes
Checklist:
Signed-off-by.